Rf Asic Helgo; Afc Function; Antenna - Nokia NPL-4 Series Manual

NPL-4/5/RM-104
System Module and User Interface

RF ASIC Helgo

The RF ASIC module includes:
- TFBGA88
- Balanced I/Q demodulator and balanced I/Q modulator
- Power control operational amplifier, acts as an error amplifier
- The signal from VCO is balanced, frequencies 3296 to 3980 MHz
- GSM850/EGSM900 and GSM1800 low noise amplifier (LNA) are integrated.
The Helgo can be tested by test points only.

AFC function

AFC is used to lock the transceiver's clock to the frequency of the base station.

Antenna

The NPL-4 (GSM850/GSM1800/GSM1900) and NPL-5 & RM-104 (EGSM900/GSM1800/
GSM1900) transceivers have their own internal antennas.
Copyright © 2005 Nokia Corporation. All rights reserved.
Page 86
Figure 41: Power Amplifier
900
GSM850/EGSM900
EGSM
out
DCS/
GSM1800/1900
PCS
out
EGSM900
GSM1800/1900
EGSM DCS/PCS
Power Power
control control
Nokia Customer Care
900
GSM850/EGSM900 EGSM
in
DCS/
GSM1800/1900
PCS
in
Power
detector
Mode
Issue 2 05/05